Fastening device



My z3, 1933. E NCH 1,909,941

FASTENING DEVICE l Filed April 25, 1952 I N VEN TOR.

ATTORNEYS.

Patented May 23, 1933 UNITED.sr'res` CALEB F. FINGH, or PROVIDENCE, rt1`1c51jri` IsnANnL' AssIGNoR To BAU iasTENEB. colin PATENTf-OFFIC f rANY, A ConronafrroN ory RHODE IsLANDj i j" 'application med April 25, 1932. "seriai No. 607,393. i

This invention relates! to a fastening` de` vice having separable parts and has-for one of its objects to, provide means for lockingY the separable/parts of the `device in assembled 5 relation. f

Another object of this vinvention is the 4pro-` vision of a construction'having stud, and socket members which threadingly engage, such that the threads willx'cooperate `with some means additional to the threads topref` vent the parts from being unscrewed one with relation to the other. 1 -i `A further object of theinvention is: the provision of a construction `which willbe simple and inexpensive to makeand one which through continued operation will notV loose its eiciency in locking the parts together. c

With these and other objects inl View, ythe invention consists `of certain 'novel features of construction, as will be more fully 1described,` and particularly pointed-out yin the appended claims. f j

In the accompanying' drawing:

I Fig. l is a plan view of a key casein which my fastening device is here shown for the purpose of illustration.

Fig. 2 is a section on line 2 2 of Fig. l. Fig. 3 'is a side elevation of the stud mem- '30 ber. y

Fig. 4 is a central sectional View of the socket member.

Fig. 5 is a view showing the stud and socket member assembled v withV the socket 3 member in section.

Fastening devices employing screw machine threadingly engaging part-s cannot be made in a practical way such that the threads will tightly fit, and accordingly when the parts engage they are somewhat loose and there is not a suiiciently close iit to cause enough friction to prevent accidental unscrewing of the parts7 and accordingly it is l; usual in the provision of such structures to 'J provide a head or some abutment against which one of the members will engage to force one edge of the Vthreads against one edge of the helical groove in which it is lodged so that suiiicient pressure is developed to cause friction to retard an unscrew- .afWth reference t0, .Shown in Fig- 1` e key Case ,10 formed `olf e ing movement ofthe This, however,V i

is not satisfactory as it may easily become loosened whereas by my invention I provide aconstruction which will not accidentally become soloosened. J4 i v In the illustration which I have chosen to show this invention the fasteningdevice is of the: stud member rwith such pressure as could be had to prevent unscrewing by reason of tightly turning the parts together through engagementhwith their` heads. It was desired `that the heads be as thin as possible to prevent their being cumbersomein their use',

in a key holder such as I have shown which is placedin; the pocket; and vtight `turning was retard-edftosome extentby the` thinness aiy ofl the heads which could not be readily gripped i AIn Order that these undesirableeonditions maybeavoided and yet obtain a greater securing action -between the (parts, I have provided a ,taperedpinner surface at the endof the shank of the socket member with a con` ical surface on the stud memberfto engage therewith so 'lthatas the parts are screwed `together4 these two surfaces are forced'one into the 4other withia binding fit and thus'IL-p'rovide an increasedl surface engagement "to frictionally lock the parts against unthread ing Ifor separation. Thisy arrangement is such thatal,though subject tos'o-me'wear, the wear will be taken up by reason of theshape loosened even though the threads become worn; by use; and the following is adetailed 4description of the present embodimentfof this "inventionv illustrating the preferred 'means by= which these advantageous'resmts maybe accomplishgd. Y y

the dra-willig,k p have flexible cover vsuch as leather with piercings of thev partsfso that the lock cannot become i 11 and 12 on either side through which there extendsvthe fastening device for the mounting of the keys. 'A lip 13 with a snap fastener, button or other securing means 14 is provided for holding the case in closed position. v The fastening device for suspending the keys consists of a socket member 15 having Y a shank portion 16 with an integralhead 17 anda bore 18 threaded as at 19 for a portion of the length and'leaving' an unthreadedftapered flaring portion 20'at' its free end.

The stud member consists of a threaded shank 21 and an integral head 22.( The threads 23 on thisshank terminate ata point 24 spaced from the end 25 and between this point of termination of the threads and the head there is provided a conical surface 26 which substantially lits the conical surface 20 in the socket member. For engagement the threaded shank 21 is inserted into the bore 18 to engage the threads 19 thereof and the parts'v are screwed together until the-'surfaces 2O and 26 tightly bind; which will occur in a position substantially as illustrated in Fig. 5, with the end 27 of the socket member spaced from the inner surface of the head 22 of the stud member. The taper may be varied in a degree to cause the desired binding action between the parts'.

If the threads become worn or enlarged or if some wear takes place between the tapered surfaces the parts will be drawn slightly closer together and the frictional contact be-' tween .the'surfaces of the parts will be maintained to lock the parts together and thus will require additional rotating strain between the parts to loosen them for disengagement. It will clearly be seen, by referring to ure 2 of the drawing, that the size of the opening 11 in the key case 10 adjacent the head `on thestud member is such that it permits the relative free movement 'of the' stud member within the socket member for adjusting the frictional vcontact described above.l

The foregoing description is directed sole'- Fig into frictional engagement, the tapered por-- tion of the stud being of greater length than the flaring seat of the socket member, where-V Y by the tapered portion of the socket member may be forced along the tapered seat ofthe stud member toa degree necessary to alone",

insure positive locking of the members, and

the openings in the casing being greater thanA the outside diameter of said socket and stud members' tovpermit the relative free move-z ment between sai-d members.

2. A fastening device adapted to extendI throughV aligned openings in a casing, comprising a socketmember having a tubular internally threaded shank with an internally flaring non-threaded seat at one end,'and an:` enlarged head at the other end,-a stud member having an enlarged head at oney end, a threaded shank at the opposite end adapted to engage said internal threads and hav-- ing a tapered portion complementary to the tapered portionv in the socket member, where by the stud memberthreadedlyadvances socket and .stud members to permit the relative free movement between said members.

In testimony whereof I affix my signature.

y p CALEB F. FINCH.

ly towards the construction illustrated, but 'Y I desire it to be understood that I reserve the privilegejofresorting to all the mechanical changes to which the -device is susceptible, the :invention being defined and limited only by the terms of the appended claims.

I claim: 1'. A' fastening device adapted tol extend through aligned openingsin a casing, com-V prising a socket member having a tubular internally threaded shank andan internally {fla-ring non-threaded seat at one end, a stud member having a threaded shank adapted to engage said internal threads and having'a tapered portion complementary to the tapered portion inthe socket member, whereby the stud member threadedly 'advances kwithin the theaded portion of the socket A member upon relative rotation of said mern- Y bers,"until the ytapered portions are brought 

